Furnace tapping device



Nov 24, 1931. N. Rin-Avls 1,833,739

FURNACE TAPPING DEVICE Filed oct. 23. 1930 Inventor'.

Neville R. Davis.

im www@ .His Abb orng.

NEvIILE LEYLAND D My invention relatesto furnace tappingfde-l vices,more particularly to furnace tapping devices Which are intended tobeused at'or l near the bottom ofalfurnacdand has for its 15J objectthe'provisionbf an improved device of-this character;V

According toV one formioffmyinvention" themelting furnacehas an orificeat the'pla'ce l` 4or (':rucible Vl0 yvvliich is made; of any suitalole',` s refractory fmat'erial,` and; Vanj"outer.` liningvlu whichmaybe madeof'refraotory brick` lsand'or'a'ny suitable'materials suchasare'` i WhereI it VVis [desired the furnace should he. "101 tappedandaltWo-part plug is provided,v one part forming the end thereof "beingadapted to lit substantially the tapping orice; and other part beingarranged so that acircula- 15 through or therearound." y

v The tW-o parts of the plug tained in clo'se contact or are'detach'aloly` connected by a joint, asolderedjointfor eX- ample, sothat a sufficiently good heatcon ducting path is formed to preventthesolid partof the plug `from `melting' so--longfasthe coolinghcirculationis kmaintained about the otherwpart.A When theplugis inposition'in the tapping orifice the solid portion being 25 cooled willprevent leakage of metal around? the plug by solidifyingg;V the molten`metal Where the tvvo parts are soldered together the joint Will `meltwhen the coolingcirculation has ceas'ed. "After a certain intervaloftime'v depending upon thesi'ze of the fsolid portion` and the'materialofZvVhiCh itis made this portion will be melted jby-'the moltenfV metalabove and Ithe furnacefis :poured:V After fthe; furnacehas `heenpouredthe fluid cooled porV .tion of the plugmay be provided' with? afresh solid part and inserted inthe tapp'ing'orice from the outside ofthe Afurnace,' Which is' then ready for a fresh-charge@ l f 1 'l means`which the cooled' portion may be inserted in thetapping orifice and insome f Cases may not be attCh-d t0 the solid part O ftheplug'. l r- 50For a more complete understandingoflmy.

invention'rreferenceishouldbehadto the aicf i i 0 When it is desired topour thefurnaoe the` coolingv ifluid, ff water "forfexamplgg A Thejfluidcooled part offthe plug forms the coolingfluid. .1 v The inner end ofthetapping oriliceflmay AvIs,' oF sLE,.;ENenAND,i Assieivon; rrotenana:aanyk uniroma1@ conf-'l '3f H 'companying drawing inwhich"thesingle" ure illustratesin` vertical section'ftheh(i'fiv'forr'r` A portionofametal melting furnaceproyided l the furnaceWalls coin-prise an innerlining used inthe Aconstruction of melting Anouter casing 12 is provided ifor the Vflg'irnna'cel hemadeofjmetalVplateyor straps. #Acompaifa' tivelyflargevapertureg`indieatedat 13,Fispro Y i vided in the furnace `lining and brick bottom,"

formed"offfire` clay,V or Vsome suitable [similar `materialandsupportedby'the casing l2lafs' shown.'A The nozzle" is I fornf'ledvvitha Atapered` opening 'therethrough ,to accommodate; the

Vloe-"off"gannisterior silica,"orlotlier materialfs,

suitahl'forthe purpose@f n 1 is c formed in 'two arts, asol'id` p art*116, lyvlich closes the nnerportionof thetapping orifice 17@ andvvhichpijeferablyis formed 'of' Ina-1, fi" i il be i 1 terialsimilar'to-themetal to be melted,

f a.V Vsoldered joint Slis Aprovided"fvvitlijy l 'nwinternal'tuhe 201 sothat'fa` cirou'l maintained; in a'vvellflnovvnfinanfner t drawingindicate the directionfofr'mo'tio `of be aredfasshovvn so as toaffo'rdaneas'ypath,

f or the meltedcharge'tojflovvoutyvvlien y furnace'i's bei/ngi'poured.;lThe entirefurnaeeglog 1;

wThet'apping device comprisesaplugvvliich 'i arqa-per o' Y V'Vllren'itis desired to tapthe furnae., the 'waterl circulation 1 isf stopped vand the` heat l I from the: molten Charge \is communicated through'thesolid portion lof 'theplug to .the j oint- @19 j and melts the Solder,whereupon--, @"fhe'hellw parte-18' of the-Plueian @With-...v g drawnandafter an intervaloftime tli eleolidv 1 part 16 and thebuttonofjsol-idied metal; 'around it will he; melted bytheheatfofe the 1'i vcharge and'ztheifurnace will emptythrough @edifice-17,zrhefsoiidrporuon of the plug willhe absorbed, in-andvcome' awaywith'the l f tions'a's fall within the tfr'ueepirit andgscope 1's raiseda convenient. distancej'from thief 'n t somecases besuiicienttocirculate air-ora` ground` on feet (not shown), or is supported 1n aframework or cradle V(not shown), so-A that sulicient room is affordedVloelow the botltom to admit of manipulation of the plug" and alsotopermit a mould oroonduitto be placed? in vposition into Vwhich thefVY'nfelt'e'df chargefeanflow when the furnace is tapped. L' Inpreparing` the furnace for operation',

oharge is melted willfbe 'smallf furnace having been ,chargedY` withmaterial, coolingwater is circulated V.through the lower"tuhular/'portion 18 ofthe plugfrom any suitable.v` S1`116ean` 0Wng fw'theeood theme11 @0111 fn* ductivity between this lowerpart of `thleplug`anidits solid part 16,thes`o1id portionwillbe ,g maintained eool- Vevenfaftenjthe furnace hargehas melted.v .Usually it will-heffound thatasfthe charge'melts andi runsdown intoy the-fportion vofthe orificeimmediately surif Y roundingfthesolid vpart 16 ofthe-plug'itwillj`solidifyby reasonofthe coolingeffeetofisaid VV'cha1 "ge. i Y v '5 J-fDuringthepouring it Vgenerally happens 'f that partioff. the` :lining-V15 f '=the,aperture inthe-nozzle is carried-away by theistreamof molten;metal.: The-f nozzle',` heweveitg,` ,will generally lasjt f for;`seiejralmelts',V but, may', Ogf q course,{ be replaced atgjany timeyAVand -particILi-vv flarly :whenfijrelining thev furnace. Theflowervonhollow-fpara 18 of the plug-mayv beusedf solidzportion and 4willforma buttonewhi'eh I pinge.

willeffeetually seal. the orifcelf?. -lff Y MOH-'16' andtheplugreinsert'ed when prepare 1 ing.'thefu'rnaee'for-afreshcharge.

' n Some kcases solderingat thefjoint 19, may be Vdispensediwithifsuliciently goed there mally conductive contactis maintained bei; Ytween-thejtwo parte of the;plugfjtoenalole a fpriloer.;` cooling. of thesolidpartrl Y toitakei f portionlas that'ther-metalSurrounding;Said

projecting portion (is maintained. alsoli'dil Q the; tWO-partplugf is:inserted invthe tapered i f )peningfin `the 'nozzle, and gannisteroiigsilica or other material indicated at 1K5vv isrammed tVftherearound'so, as to retain-itin'p'oeitionil'frv Inv 'general theplug, will only he required to j be held in :position Y during theYcharging into I: .the furnace of the material tolse melted,-and

Y owing tothe comparativelywsmall area ofthe fp lug' the weight tendingto 'force'. it outfof the orifice f before the', bottom part of the,

byLettefs- Pteritfof'theQUnitd Stengel 2;1. Y;A- tapping devicey for amelting-funn ce provided withgfan'oriice therein; Comprising throughthelowerpartiofdthefplugit may I coolinggae through lsaid part, theVelocity- *y L "gliele is desirable in' nl aeefumfwhn it is determinedto.. tap :the-furnace aN rapid Structed to enable this to A loeeffected. `VIn designing' the plug,fthereforegjthe fol-Yehangein'thetemperature ofthe plugshall 'f Vtake :place-when theVcooling'fis'H discontinued Soit-hat thegcool'edgportin maybev removed p"y and-the furnace teemed with as little loss-0f' timeasl'afssilole,Vtheplug ispreferably conlowing pointeshouldbe bornein mind. The

solderedjoint'when employed must not melt 1 i* Vwhilebeing', cooled,`consequentlytlie-e'ooling f must be capable ofremovingy heat .at.ja'coneideralole rate; that iS,r the'cooling he eX-...1 ceedingl'yeffective andthe coolmglluidmust heable'to diesip'ateja considerableamount fojf energy. vGn :theother handy the'inner portionf of. the plugmust not betoo longfotherwiseff whenV the cooling is' Stoppedf the timetaken I Itoy-meltthev plug before .teeming oanjtak'e place would beexcessiveand'occasiona greatVIV wastefof time. Itis clear,therefore,that-the; j rate of-removalof energybythecooling sys-- tem isyeryimportant, andi-Very effective ofthe comparatively small areaof the plugavailable oirkwhichthe 'cooling fluidk eaniln` Y n The invention yeryeuitahleffor `use electric furnaces Ip'articularly of the induc--tiontype,and in'euchcases theplug may ad-'' y vantageouslyloevconnected to earth for the 1 purpose; of earthing t the Acharge lasbythe numeral 22 inthe drawing.

3,6 E i cooling must beg-employed especially in yiew ment ofmyinventiomiit willloe unders'toodf Y made,V` and 'L the'reforej,Vcontemplate 'by the appendedclaims tolcov'er anyeuch modifi'ea-l fmetallicplugmember adapted to closegs,

as to 4Vmaintain vvthe fur-nace {charge-'adj ac ent videdwith a tappingorieeg ofj a iplugffor,

Saidorifice ycomprising a portion arrangedto t close saidl orificer andprojected-intol-Sald; lfurj nace andineans for. bringing a cooling``-medium into Contactv withjsaid-oriiieeelosingf orifice and means'forcooling'said-'membe oi 12e Y y died condition as long as saidportionris cooled but is melted when' said cooling medium` is removed.

3. A melting furnace. comprising, walls` having a tapping yorificetherein, a member substantially closing Said` orifice, a secondmember,binder metal having a lowerineltf n ing point than said firstmember between said cooling said V:sfecond member.

4. The combinationfwnh ,first and said secondmembers, and means for:-`

Va "melting furnace provided with walls having a' tappingorificetherein, of a plug for said orifice oomprising a substantiallysolidV metallic portion lpositioned in said orifice so as tosubstantially close Ait and a second metallic portion.,

in heat conducting relation with Ysaid 4first portion, said secondportion having a conduit therein through which a cooling medium can becirculated, whereby that portion of the furnace'charge in contact witheaidfirstV A portion is maintained in a solid state.

p f' from a material similar tothemetal to be 4 melted .and meansforlcirculatmg afcoolmg medium to cool said lplug-hire` membe'rf-so" 5.A furnace comprising walls having'a tapping orifice therein and atapping devicey for closing-said orifice comprising afplug-V having asubstantially solid portion adapted 'to be tted into said orifice so asto substantially close said orifice, a tubular portion detachablyconnected to said solidportion in good thermal relation therewithandvineansl for circulating a cooling fluid 'through Said tubularportion.

6. The combinationwith aV metal melting furnace having walls providedwith` a tap` ping vorifice therein, of a tapping device for closing saidorifice comprisinga plug-like member,said plug-like member being formedthat that portion of the furnace` charge` in contact with said member ismaintained in a] solidlfiedcondltion asvlong as said memn ber is cooledbut is vmeltedf and with `itsaid medium is stopped.` 4 p p.

` ,having a tapping orificetherein, and@J plug* plug when thecirculation of Saidfcooling 7. A melting for closing saidorifice,'saidplug having la 8. A metal melting: furnace comprising'wallshaving an aperture therein, a nozzle inV l said aperture, aheatrefractory materlalin said nozzle forming i an V'orifice,therethrough and a plug for closing Saidorificercomprising asubstantially solid'metallic portion arranged to be fitted in the innerend of said orifice soas to substantially closesaid innerv Yend,`1atubular `member secured to 'said Solid n,

11. The combination withfa metal melting furnace `providedwith walls`having a tap-1 Y cooled. Vl .Y

In witnessfwhereof, I have hereunto lset Y myhandthis thirteenth-day ofOctober,p1930.' f i *,NEVILLEBXLAND'DAVIS. j

portion andprojectingfoutwardlyvfromeaid; Y orifice, a secondtubularmember `within-said e w first tubular member forfoonveyingapfluid f medium therethrough, and means providingf for [the passageV of`said ,fluidmedium from `aaidfirst tubular member. 'l L furnacecomprising' 5' 9. UA metal melting WallaprovidedHwith` a'`nozzlevlike/apferture 1f f therein anda tappingdevicef forclosingsaidf.

aperture comprising a plug-like"member arranged in said aperture soastosubstantiallyV g lclose Said aperture andV having a substantialportion,.projecting.-` into said furnace, land L means for coolingsaidfplug-lilemembereoy that the metal "surroundingfeaid proj ecting Aportion: is maintained .in a solidified vcondi tion while saidmemberis.` cooled.

r 10. The combination'with p 4 p metal'"melt-jf."A c I ing furnacehaving walls'` provided with a'l tapping oric'e therein of atapping'clevice'lgig, 1 i

for saiclvorifice comprising-.a plug adapted ,j

tobe inserted in svaid'or'ificeV so asV to substanf tiallyrcioSe saidorifice andso` that@ portion Aj; Y of saidvplug` is in electricalcontact withythe furnace charge, means for Vcooling `saidplug and 'meansincluding said plug-'providing ay i. jl'

grounding circuit for saidfurnace charge."

ping orifice therein, said' orifice being `pro-.

vided with a portion `flarc-id'toward thefin-f VteriorV ofts'aidfurnace," af'cylindrical plug memberfarrangedfto close saidoriiice'andf-4having aportion `embraced bysaidflared?A portion and means "for coolingv said plug iso` thatlthe; metal between said lplug and .the

walls .of said'. flared ,portion maintaine'diin jrV a solidifiedcondition'asfflo-ngrassaidplug'fis `I i' Yf ilme- Y f 115'- l so."Y

